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Aperture is the opening in the diaphragm of a camera lens. For questions relating to Apple's photo management software, please use [apple-aperture] instead.

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4answers
128 views

Is the wide aperture and bokeh of a 50mm prime more important than getting to the 70-90mm range for portraits?

I've a Pentax K-30 with the following lens: Pentax-M 50mm 1.7 manual focus Tamron 17-50mm 2.8 autofocus Pentax 55-300mm 4-5.6 autofocus Considering that : Pentax 50mm has the nicest bokeh and ...
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vote
1answer
43 views

Mathematical relation between aperture and DOF [duplicate]

I know that aperture and DOF are inversely proportional. But, can anybody explain to me the Physics/Optics behind that? What's the mathematical relation that relates aperture with DOF?
0
votes
1answer
63 views

Questions about ISO noise and variable aperture on zoom lenses [closed]

Sorry if these questions are duplicate, but did not understand how to use the search tool which is in the right corner of the page. Images shot at a high ISO have high amounts of grain which is ...
0
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0answers
22 views

What does it mean to be out of focus [duplicate]

I have browsed dozens of photography and noticed that only a handful actually try to reconcile the photography world with the real world. My ultimate goal is to be able to easily explain to anyone, of ...
4
votes
1answer
552 views

Why does changing the aperture cause lag in live view and in videos?

On my Canon 70D there's a considerable lag during the change of aperture when pressing the depth of field preview button. This lag also occurs during video recording, which causes the video to halt ...
14
votes
2answers
3k views

How do DSLRs figure out what aperture to select in P mode?

In program mode, DSLRs adjust not only the ISO and the shutter speed, but also the aperture. The aperture has a huge impact in some situations. For example, when shooting a close subject in front of ...
19
votes
9answers
31k views

What is an easy way to remember the full stop scale?

If you were teaching someone new to photography the full stop scales, is there a better way then flat out memorizing these values? Does anyone have an easy way that they remember the scale? Would it ...
0
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7answers
28k views

How to change aperture in manual mode on an entry-level Nikon SLR?

In manual mode on my Nikon D3200 I cannot change just the f/stop setting. It only changes in relation to the other settings. How can I reproduce settings that I have found in books on photography if I ...
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2answers
59 views

Why can't I change Aperture? Canon 60D

I am in manual mode (M on the top left scroll wheel above the on button) using a sigma 10-20mm F4-5.6 and then I spin the scroll wheel (which has a "set" button in the middle) below the 'q' button, ...
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5answers
224 views

How was this photo taken

My question is how was this picture taken. And I've got a few assumptions I made regarding the photo, please correct me when I am wrong. Low aperture value, like 1.4-2.0 Quite high shutter speed, my ...
0
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1answer
110 views

Technique to manually set aperture and focus for a low light scene during normally lit time of day?

I have a scenario that requires manually setting the aperture and focus on a lens attached to a machine vision camera on an outdoor scene (mirrorless camera with global shutter). I need to manually ...
0
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1answer
162 views

How to remove oil from aperture blades?

If you go on ebay or other second hand places, you'll see a fair amount of lenses that have oil on the aperture (particularly on older lenses). I've done some reading and it looks like this oil is ...
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0answers
40 views

Shutter Speed and Aperture won't change [closed]

I just got a pentax k-50. After taking a picture I cannot change the shutter speed or aperture unless I change to a different setting like shutter or aperture priority. Then I can change settings, but ...
1
vote
1answer
226 views

How to manually select aperture and shutter speed but have auto ISO on a Canon 7D?

I want to be able to manually adjust aperture and shutter speed, but leave ISO being set automatically. How can I do this on my Canon 7D?
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2answers
719 views

Canon 50mm f/1.8 STM vs Canon 50mm f/1.8 II?

What are difference between canon 50 mm f/1.8 STM vs canon 50 mm f/1.8 II ? which is better to buy?
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2answers
81 views

How does sensor size affect the brightness of an image given the same field of view and aperture?

Lets say we have two image sensors, each one with 1MPixel resolution but differing in size. The first sensor has the size 1/3", the other one 1". Each sensor is equipped with a suitable lens (for the ...
7
votes
1answer
132 views

What's the point of a shutter when the sensor is clearly working all the time to provide live view?

Something I don't understand about compact digital cameras is how their shutters work. On the screen at the back of the camera, a preview is constantly shown. I assume this preview is made by light ...
3
votes
2answers
181 views

How does the Sony 135 F2.8 [T4.5] STF twin aperture lens design work?

I stumbled across the Sony 135 F2.8 [T4.5] STF other day. I have read through the review but I can't for the life of me figure out what the twin-aperture setup is supposed to do!
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3answers
2k views

Why doesn't an f/1.8 lens result in a lower ISO than an f/2.8 lens?

When I bought my Sony NEX-5R, I had a choice of an f/1.8 or an f/2.8 lens (both are prime, normal lenses). I was told the 1.8 will work better for low-light photography since it will let in lot more ...
1
vote
1answer
83 views

Why don't all zoom lenses have variable f-numbers? [duplicate]

As I understand it, the f-number is a ratio between the focal length and the aperture diameter. A zoom lens can change focal length, but shouldn't the maximum aperture be a fixed size? If so, that ...
10
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3answers
540 views

What is the limiting factor in lens construction when it comes to f-stop values?

This widely praised Nikon 105mm macro lens has a maximum f-stop value of 2.8. I've held it in my hands, it's a big lens. Meanwhile, this 50mm Nikon lens can go up to f/1.2, despite being 25% cheaper ...
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votes
4answers
4k views

What are the advantages of a lens having a fixed maximum aperture?

What are the advantages of a lens having a Fixed Maximum Aperture? Previous answers have indicated that "pros tend to want constant apertures in zoom lenses". While in general lenses with a fixed ...
2
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2answers
169 views

Why does my lens refocus when the f-stop is changed?

I have a prime Sigma f1.4 50mm lens on my Nikon D90 in P mode and focus mode on a set point of the field and notice that when I am using a tripod and change the f-stop that the camera changes the ...
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1answer
207 views

Why can't I adjust the aperture in manual mode on my 5D MkII?

Lately I have been having trouble adjusting my aperture when my 5 d mark 2 is in manual mode. Usually I am able to turn the thick dial at the back of the camera and adjust the aperture. Lately this is ...
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8answers
57k views

What is aperture, and how does it affect my photographs?

How does aperture affect my photographs? Why should I care about the aperture with which a photo was taken?
5
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1answer
164 views

What prevents a f/1.8, 24 mm - 70 mm or similar range zoom lens from being made? [duplicate]

I see that it is common to have professional grade lenses such as 24-70mm lenses made at f/2.8. After using a 50mm/1.8, I was wondering what would prevent a more versatile zoom lens to be made that ...
3
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3answers
2k views

What would be a good indoor setup to find a lens's sharpest aperture?

I read the whole of How do you find out the "sweet spot" of a lens? — great question and answer, but it didn't discuss a potential homemade rig for finding the sharpness aperture of my ...
13
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7answers
663 views

Does lens speed still increase meaningfully when the physical aperture is larger than the sensor size?

This question came to me this morning, thinking about 50mm lenses. I have the Pentax 50mm f/1.7 (manual) and it's a very nice lens, but would be considered (relatively) slow on 35mm film, and many ...
0
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1answer
71 views

Getting a sharp focus on a 50mm when the subject is at 5m - 10m [duplicate]

I'm a novice photographer with a 450D/XSi. I'm using a 50mm/1.8 prime lens to start out and I noticed that a lot of times my pictures end up not being sharp for stationary scenes. I was mostly using ...
3
votes
1answer
96 views

Why is the sharpness of a lens often determined by aperture?

Related to: How do you find out the "sweet spot" of a lens? I am wondering why most lenses resolve finer detail when stopped down a bit. Further, after the "sweet spot", after stopping ...
0
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1answer
70 views

Nikon D3 - Cycling of aperture values

I have a rather trusty Nikon D3, we've been through 180k actuations together. But I have a question, which i'm really hoping i've not been missing all these years. Is there a way to program the body ...
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3answers
76 views

How can I further decrease the exposure in a studio environment?

I was trying a few things yesterday involving a studio backdrop which was lit using a grid to provide a gradient effect and a subject about 3ft in front of it, with its own lighting through umbrellas. ...
0
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1answer
117 views

Photos imported into Aperture aren't showing up — why not?

I imported about 500 images into Aperture (mostly CR2, but some jpg), and for some reason they're not showing up in my library. If I right click on my library and select "Show Package Contents" and ...
0
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1answer
81 views

I want to know about the relationship between focal length and aperture [duplicate]

I have Nikon D7000 and I know the basic relation of shutter speed, aperture, and iso. All I want to know is focal length and aperture relation. As I zoom in the camera the f/stop increases (e.g. it ...
4
votes
4answers
1k views

What are the disadvantages of super-zoom cameras compared to binoculars?

Maybe it is clear from my question that I don't know much about lenses, both on binoculars and super-zoom cameras, for example I don't know how can I compare the light that enters a binocular with a ...
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0answers
46 views

Anyone know how to save a Photoshop file, naming it from metadata or exifdata?

Thanks for any feedback in advance. I have an action that retrieves an image from Aperture, manipulates it, saves it back to the Aperture library in tiff format, then performs a save for web with an ...
0
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1answer
411 views

Will the Sony FDR-AX100 really be better in low light than the Sony FDR-AX33, even though the latter has a faster lens?

I see that Sony FDR-AX100's lens has opens at f/2.8 while Sony FDR-AX33's lens opens at f/1.8 I am often doing photos (Canon 6D) or videos in places where a f/1.8 lens would be a great advantage over ...
3
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6answers
218 views

How can I see the photo settings like f-stop, ISO etc. of a image?

I am new to photography and enjoying shooting with my Nikon D3200 camera. Once I take a photo, is there any tool by Nikon or a third party which can give me info like F-stop, ISO, Shutter speed, etc? ...
1
vote
1answer
178 views

What lenses can produce a clean starburst effect?

I have seen several examples of a beautiful lens effect, naturally due to a stopped down aperture, but not like a lens star I have managed to create myself - it is so clean. Here is an example: ...
4
votes
2answers
1k views

How can I fix a Nikon DX 18-135mm with an aperture stuck open?

I am currently on a trip and I brought an 18-135mm lens and a 35mm prime as my two lenses for the trip. When I took my zoom out of my backpack off the plane and put it on my camera, I immediately ...
0
votes
2answers
94 views

what is the camera fstop and lens fstop correlation? [duplicate]

my sigma 50-500mm DG lens has range of f 4.5 - f 6.3, but in my Canon 70D camera I can still set fstop to 22 in manual mode. 1)How these two correlate? 2)Would a f22 setting in camera will have no ...
0
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2answers
126 views

How do shutter speed, ISO and aperture work together to control exposure?

When shooting in natural or ambient artificial light (without flash, basically), how do light, shutter speed, ISO and aperture work together to control exposure?
1
vote
1answer
129 views

What is the -5 to +5 scale below the aperture number on the back of my Canon DSLR?

Hello guys, I am completely new on this photography world and honestly I don't have much knowledge about it, but I really want to learn... and read. I've been reading about modes, light, shutter ...
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vote
3answers
193 views

Why should I use the widest aperture for star photography?

Well, this question may sound dumb to some folks but I am really confused here. I was reading this article about Photographing Stars Using a Kit Lens where author talks about keeping widest aperture ...
0
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1answer
78 views

Graininess and lack of detail [duplicate]

Hello fellow lens loving junkies! I have been struggling to get very sharp, non-grainy images. I have a Canon Rebel Eos T3i. Even images at 100 ISO are not as sharp as I would like. Not sure if it is ...
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votes
5answers
2k views

Do bigger focal lengths capture more light?

I never understood what the f really stands for in the f-stop values, like f/1.8. Wikipedia explains it in various articles, but I still find it very confusing. What I understand, though, is that it ...
1
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0answers
81 views

Scrum photo technique

I remember seeing some photos taken of children which had been staged by getting the kids to form a rugby scrum - all in a circle with arms around each others shoulder and leaning in to look at the ...
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1answer
48 views

What is the effect of changing the Aperture [duplicate]

What is the effect of changing the Aperture on the quality of the image?
1
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2answers
118 views

Why change to open-aperture metering when this causes the need to stop-down for old lenses

On my Pentax ME Super with a legacy lens (Pentax SMC 50mm 1.7) my camera meters at all aperture ring settings. Yet, if I transfer this lens to a modern Pentax DSLR, I need to stop down the lens to ...
0
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0answers
47 views

Achieving Bokeh using Aperture vs Focus Point [duplicate]

In terms of the bokeh aesthetic, is using a wide aperture the same as using a narrow aperture and focusing on a foreground object? Are there advantages of doing it one way or the other? I took this ...